I think I would have been one of those parents you knew didn't read to their kids every night as despite reading to them every night from when they were all babies, the boys didn't become fluent at reading til they were 8-9 (and not from lack of trying especially on the part of the eldest as he really, really wanted to be able to read and not just because his younger sister managed to pick it up at 5).
On the bright side they all like reading, they don't recreationally devour books like I used to at their age, but they do read for both fun and profit :)
Interviews for 5yos sounds pretty hardcore. Are there things that they do that helps you determine whether their reading difficulties are from parents not reading to them vs something like dyslexia or other learning difficulties or is it mostly awesome teacher sense developed from years of experience? :D
You can usually tell from the simple questions and little quizzes we do where a student it at. Any difficulties are usually clear cut too from the testing and conversations with parents. It's not always why children can't read, but in a large number of cases I see it is. My awesome teacher powers are just that.....Awesome???